pope benedict v>> pope benedict xvi is expected to address an audience at the vatican. he will step down for every 28 due to health concerns. is spokesperson says that he's been living with a pacemaker and several months ago underwent surgery to have the battery replaced. will live in a monastery near the vatican when he steps down. >> if you are looking to book a flight anytime soon, you might want to be patient. the best days to book tickets may not be when you thought. >> with details on that and what wall street is watching today if we will check in with bloomberg headquarters in just a little while. >> it's 36 degrees. >> still to come, we're learning more about the shooting that killed two university of >> welcome back. 4:39. we want to check in with jacqui jeras. >> a little snow in the forecast? >> yes. a mix with rain and snow in d.c. but no accumulation will be expected here. a winter weather advisory has been issued for parts of west virginia and northern maryland. you can see mineral, hampshire and hardy counties all included for the potential of maybe 4 inches of snow.